Video signal mixer device

Details Video signal mixer device Video signal mixer device

1987-03-27

1989-07-04

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358181, H04N 5272

Patent

active

048455652

ABSTRACT:
A mixer device designed for a TV production control room mixes incoming video signals of PAL, NTSC or MAC standard. To avoid any differences in video signal propagation time through a known video grid, the latter is suppressed, and a grid with narrower band width switches chopping signals selectively controlling attenuations of the incoming video signals in analog multipliers. The chopping signals are derived in operator circuits as a function of effect and dissolve signals designed to chop image planes to be superposed into a resultant image. In particular, amplitude complementarity of the chopping signals between two predetermined levels is ensured, whatever the dissolves and effects selected, and a proportion of a black image signal, transmitted normally during line and field blankings, is mixed during a black fade or a darkening to be created in the resultant image.

REFERENCES:
patent: 2653186 (1953-09-01), Hurford
patent: 3598908 (1971-08-01), Poulett
patent: 3604849 (1971-09-01), Skrydstrup
patent: 3619495 (1971-11-01), Ito et al.
patent: 3673324 (1972-06-01), Ito et al.
patent: 4684990 (1987-08-01), Oxley

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